Income Taxes

3 Months Ended

Mar. 31, 2024

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The Company makes an estimate of its anticipated effective tax rate for the year as of the end of each quarterly period within its fiscal year. In interim periods, income tax expense is calculated by applying the anticipated annual effective tax rate to year-to-date earnings before income taxes. Certain unusual or infrequently occurring items are excluded from the estimated annual rate calculation. Such items include regulatory disallowances and excess tax benefits or deficiencies related to stock

awards. At March 31, 2024, PNMR, PNM, and TNMP estimated their effective income tax rates for the year ended December 31, 2024 would be 14.64%, 13.09%, and 20.72%. The primary difference between the statutory income tax rates and the effective tax rates is the effect of the reduction in income tax expense resulting from the amortization of excess deferred federal income taxes.

During the three months ended March 31, 2024, income tax expense calculated by applying the expected annual effective income tax rate to earnings before income taxes was further increased by excess tax benefits related to stock awards of $0.2 million for PNMR, of which $0.1 million was allocated to PNM and $0.1 million was allocated to TNMP.

Beginning February 2018, PNM’s NM 2016 Rate Case reflected the reduction in the federal corporate income tax rate resulting from enactment of legislation commonly known as the Tax Cuts and Jobs Act (the “Tax Act”), including amortization of excess deferred federal income taxes. In accordance with the order in that case, PNM is returning the protected portion of excess deferred federal income taxes to customers over the average remaining life of plant in service as of December 31, 2017, and had been returning the unprotected portion of excess deferred federal income taxes to customers over a period of approximately twenty-three years. Pursuant to the final order in the PNM 2024 Rate Change, the remaining balance of $62.7 million of unprotected excess deferred income taxes is being returned over a five-year period. The approved settlement in the TNMP 2018 Rate Case includes a reduction in customer rates to reflect the impacts of the Tax Act beginning on January 1, 2019. PNMR, PNM, and TNMP will amortize federal excess deferred income taxes of $23.3 million, $20.7 million, and $2.6 million in 2024. See additional discussion of the impacts of the Tax Act in Note 18 of the Notes to Consolidated Financial Statements in the 2023 Annual Reports on Form 10-K.